In reply to Webster:
> in theory the scrambling grades precede the climbing grades, so you get:
That's not aways the case.
The Aonach Eagach is a Grade 2 Scramble and an Easy Rock Climb
Curved Ridge is a Grade 3 Scramble and a Moderate Rock Climb
Tower Ridge is often given Grade 3(S) and is a Diff Rock Climb.
I'd say there is an overlap rather than that they precede the climbing grades.
Scrambling vs climbing is very subjective and what the individual finds to be a scramble is quite personal. Even routes of the same technical Grade can feel quite different. I find Tower Ridge to be a great scramble but Great Ridge on Garbh Bheinn feels more like a climb to me (steeper and more sustained exposure). Both are Diff.